# SlidingBallConstraint

SlidingBallConstraint is the base class for constraints that allow their attachments to slide along an axis but not rotate, including PrismaticConstraint and CylindricalConstraint. This constrains the attachments so that their X axes are collinear but pointing in opposite directions. It also constrains the attachments so that their Y axes are parallel.

See Mechanical Constraints for more details and video demonstrations of this and other mechanical constraints.

#### Linear Power

If this constraint's ActuatorType is set to Motor, it attempts to translate the attachments with the goal of reaching Velocity. You can further control this translation through both MotorMaxAcceleration and MotorMaxForce.

If this constraint's ActuatorType is set to Servo, it attempts to translate the attachments to a set separation specified by TargetPosition. This translation is controlled by Speed, LinearResponsiveness, and ServoMaxForce.

#### Limits

You can set limits to restrict this constraint's sliding range. Enabling the LimitsEnabled property exposes the LowerLimit and UpperLimit values, as well as Restitution which defines the elasticity of the attachments when they reach either limit.

## Summary

### Properties

Sets whether the translation of the SlidingBallConstraint is actuated and, if so, what kind of actuation.

The current offset between the constraint's Attachments.

Sets whether the SlidingBallConstraint will limit the range of translation.

Specifies the "sharpness" of the linear servo motor in reaching the TargetPosition.

The lower positional limit along the X axis of Attachment0 if LimitsEnabled is true.

The constraint's maximum acceleration when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

The constraint's maximum force when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

The elasticity of the constraint's Attachments when they reach the end of the range specified by UpperLimit and LowerLimit, assuming LimitsEnabled is set to true.

The constraint's maximum force when ActuatorType is set to Servo, as the constraint attempts to reach its desired Speed.

The constraint's desired speed when ActuatorType is set to Servo, as the constraint translates towards its TargetPosition. Measured in studs per second.

The constraint's attempted target position when ActuatorType is set to Servo. Measured in studs.

The upper positional limit along the X axis of Attachment0 if LimitsEnabled is true.

The constraint's attempted velocity when ActuatorType is set to Motor. Measured in studs per second.

### Methods

### Events

## Properties

### ActuatorType

Sets whether the translation of the SlidingBallConstraint is actuated and, if so, what kind of actuation.

If ActuatorType is set to None, the joint can slide freely.

If ActuatorType is set to Motor, it attempts to translate the attachments with the goal of reaching Velocity. You can further control this translation through both MotorMaxAcceleration and MotorMaxForce.

If this constraint's ActuatorType is set to Servo, it attempts to translate the attachments to a set separation specified by TargetPosition. This translation is controlled by Speed, LinearResponsiveness, and ServoMaxForce.

### CurrentPosition

The current offset between the constraint's Attachments.

### LimitsEnabled

Sets whether the SlidingBallConstraint will limit the range of translation. If true, this property exposes the LowerLimit and UpperLimit values, as well as Restitution which defines the elasticity of the attachments when they reach either limit.

Here is a case where the UpperLimit is 2 and the LowerLimit is -1:

Here is a case where the UpperLimit is 4 and the LowerLimit is 2. Note that in this case the attachments will never be allowed to overlap; they will always be offset:

### LinearResponsiveness

Specifies the "sharpness" of the linear servo motor in reaching the TargetPosition when the derived classes' actuator type is set to Servo. Larger values correspond to faster a response and smaller values results in more damping and a slower response.

### LowerLimit

The lower positional limit along the X axis of Attachment0 if LimitsEnabled is true.

### MotorMaxAcceleration

The constraint's maximum acceleration when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

### MotorMaxForce

The constraint's maximum force when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

### Restitution

The elasticity of the constraint's Attachments when they reach the end of the range specified by UpperLimit and LowerLimit, assuming LimitsEnabled is set to true. The valid range is between 0–1.

### ServoMaxForce

The constraint's maximum force when ActuatorType is set to Servo, as the constraint attempts to reach its desired Speed.

### Size

The constraint's visualized size.

### Speed

The constraint's desired speed when ActuatorType is set to Servo, as the constraint translates towards its TargetPosition. Measured in studs per second.

### TargetPosition

The constraint's attempted target position when ActuatorType is set to Servo. Measured in studs.

### UpperLimit

The upper positional limit along the X axis of Attachment0 if LimitsEnabled is true.

### Velocity

The constraint's attempted velocity when ActuatorType is set to Motor. Measured in studs per second.